Wind tunnel testing of fans
Encyclopedia
Wind tunnel tests are performed to measure the air movement of axial fans at a specific pressure
exactly. By determining the environmental circumstances during the measuring and by revising the air-tightness afterwards, the standardization of the data is warranted.
There are 2 possible ways of measurement: a complete fan or an impeller
on a hydraulic installation. Two measuring tubes enable measurements of lower air currents (< 30.000 m³/h) as well as higher air currents (< 60.000 m³/h). The determination of the Q/h curve of the fan is one of the main objectives. To determine this curve (and to define other parameters) air technical, mechanical as well as electro technical data are measured:
Air technical:
Electro technical:
The measurement can take place on the fan or in the application in which the fan is used. With the measurement, the optimal motor-impeller combination for every application, depending on customers demands, can be designed.
The wind tunnel testing for axial fans meets the international standards and is as accurate as the wind tunnels of the German DLG
and the American AMCA and Bess Labs.
Pressure
Pressure is the force per unit area applied in a direction perpendicular to the surface of an object. Gauge pressure is the pressure relative to the local atmospheric or ambient pressure.- Definition :...
exactly. By determining the environmental circumstances during the measuring and by revising the air-tightness afterwards, the standardization of the data is warranted.
There are 2 possible ways of measurement: a complete fan or an impeller
Impeller
An impeller is a rotor inside a tube or conduit used to increase the pressure and flow of a fluid.- Impellers in pumps :...
on a hydraulic installation. Two measuring tubes enable measurements of lower air currents (< 30.000 m³/h) as well as higher air currents (< 60.000 m³/h). The determination of the Q/h curve of the fan is one of the main objectives. To determine this curve (and to define other parameters) air technical, mechanical as well as electro technical data are measured:
Air technical:
- Static pressureStatic pressureIn fluid mechanics the term static pressure has several uses:* In the design and operation of aircraft, static pressure is the air pressure in the aircraft’s static pressure system....
difference (Pa) - Amount of moved air (m³/h)
- Average air speed (m/s)
- Specific efficiency (W/1000m³/h)
- Efficiency
Electro technical:
- Tension (V)
- Current (A)
- Cos φ
- Admitted power (W) fan / impeller
- Rotations per minute (RPM)
The measurement can take place on the fan or in the application in which the fan is used. With the measurement, the optimal motor-impeller combination for every application, depending on customers demands, can be designed.
The wind tunnel testing for axial fans meets the international standards and is as accurate as the wind tunnels of the German DLG
DLG
DLG is a salsa band that mixes salsa, reggae, reggaeton, and hip-hop. The group was brought together in New York by producer Sergio George and included Huey Dunbar, Fragancia, and James "Da Barba" de Jesus.-Beginnings:Looking for vocalists, Sergio George discovered within the salsa club scenes both...
and the American AMCA and Bess Labs.